Japanese manufacturer ROHM (ROHM Co., Ltd.) recently used a self-developed structure to enclose an OLED film as a light-emitting portion in a composite substrate and an inorganic film formed by attaching an ultra-thin glass plate having a thickness of only 0.05 mm to a plastic substrate. Among the gas barriers (Gas Barrier), in addition to ensuring the same lifetime as the current OLED products packaged on glass substrates, the OLED device has been successfully developed to achieve a comparable weight. One-eighth of the existing glass substrate OLED devices and one-sixth the thickness of OLED lighting applications. The company aims to achieve a high-end lighting or display field with a sense of design. It is expected to reach a practical level around 2014 and 2015, and will be oriented toward the mass production technology of the Roll-to Roll (continuous rolling strip precision coating) process. Continuous development.
Figure 1. Left-flexible OLED device standard S type; right-bangle type
This product has a bending radius of 25mm, a weight of 0.05g/cm2, a thickness of 0.3mm, and is light and sturdy. It is also made of a plastic substrate. It is also suitable for safety and impact resistance when falling. Have an advantage. The drive voltage is 3~5 volts (V), the power consumption is 0.5~1 watt (W), the illuminance is 1000~3000 canopy (cd/m2), and the illuminating color is 2800K.
The composite material used by ROHM is a PET/PEN plastic substrate instead of a glass substrate, and is attached to an ultra-thin glass plate manufactured by Nippon Electric Glass Co., Ltd. and having a thickness of only 0.05 mm; formed on the substrate. An OLED film of a light-emitting portion, a 100-micron ITO transparent electrode, and an aluminum electrode. The OLED film is encapsulated in a composite substrate and covered with a gas barrier layer of an inorganic film, and finally a PET/PEN protective film is attached over the barrier layer.
With this new configuration, it is possible to improve the problem that the plastic substrate OLED is not long in life due to insufficient gas barrier property and being susceptible to oxygen or moisture. Although still in the test, the product life of halving the brightness is expected to be the same as that of the glass substrate OLED device, which can reach the level of 10,000 hours.
In addition, since ROHM uses a rollable flexible substrate, it can be manufactured in a mass-produced Roll-to Roll production method, and will accelerate the mass production technology of the Roll-to Roll process in the future. Efforts to improve the technology and develop the device in a large area.
Solid-state lighting challenges traditional lighting still needs to accommodate existing shelves
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